William James Deardorff

  • San Francisco, CA
  • Geriatric medicine (internal medicine) physician
NPI1003348830PAC ID6800209917
Medicare services, 2024
219
Medicare patients, 2024
133
Part D claims, 2024
893
Publications
19
MIPS score, 2024
100
Practice address
505 Parnassus Ave, Box 0296, San Francisco, CA 94143
Practice phone
Call (415) 353-2733
Professional email
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Personal email
Get personal email
Mobile number
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Social profiles

Primary practice

UCSF Helen Diller Medical Center at Parnassus Heights

Hospital · San Francisco, California

See all 5 affiliations

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William James Deardorff is a geriatric medicine (internal medicine) physician in San Francisco, California

William Deardorff practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.

William Deardorff's NPI, 1003348830, was assigned on March 30, 2017. William Deardorff graduated from Saint Louis University School Of Medicine in 2017. William Deardorff holds California license A169642.

NPI and contact details
Medicare PAC ID
6800209917
NPI enumeration date
March 30, 2017
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(415) 353-2733
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Male
Estimated age
35
Medical school graduation
2017

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

William James Deardorff practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California

William Deardorff's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights, at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143 in San Francisco County. The practice phone is (415) 353-2733.

Source: Dmand AI Affiliation Data

William James Deardorff is affiliated with 2 sites of care and 3 medical groups

William Deardorff's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. The medical group on file is UCSF Pediatrics. Dmand AI also links William Deardorff to 2 more medical groups and 1 skilled nursing facility, each named with a free account.

See all 5 affiliations for William Deardorff

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at William James Deardorff's practice

Dmand AI tracks the electronic health record (EHR) system at each site where William Deardorff practices, 2 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
UCSF Helen Diller Medical Center at Parnassus HeightsAvailable with a free account
+1 more site and 2 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

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William James Deardorff is one of 497 geriatric medicine (internal medicine) physicians in California

Geriatric medicine is William Deardorff's primary specialty in the NPI Registry, under taxonomy code 207RG0300X. William Deardorff is board certified in geriatric medicine by the American Board of Family Medicine. Dmand AI has William Deardorff's licenses on file in 2 states: California and North Carolina.

Specialties and state licenses

  • Geriatric medicine (internal medicine), CaliforniaPrimaryLicense A169642 · 2020 to 2026 · taxonomy 207RG0300X
  • North Carolina license2017 to 2020

Clinical focus

Dmand AI lists acid reflux, anxiety, arthritis, chronic diabetes, chronic hypertension, chronic kidney disease, coronary artery disease and gout among the conditions William Deardorff treats.

Geriatric medicine (internal medicine) physicians near William Deardorff

Counts of geriatric medicine (internal medicine) physicians with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

William James Deardorff billed Medicare for 219 services in 2024

CMS data shows 219 Medicare services from William Deardorff across 6 procedure codes in 2024, for 133 Medicare patients. Medicare paid $25,925 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024219
Medicare patients133
Paid by Medicare$25,925
Procedure codes6

William Deardorff's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 3312024: 18744%
Other services
2023: 822024: 3261%

William Deardorff compared with the California median for geriatric medicine (internal medicine) physicians, 2024

  • William Deardorff
  • California median
Medicare services
219vs 42448% below
Medicare patients
133vs 17825% below
Part D claims
712vs 93023% below

Medians across 466 geriatric medicine (internal medicine) physicians in California with Dmand AI profiles that report each measure.

William Deardorff's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by William Deardorff

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

William James Deardorff treated 133 Medicare patients in 2024, average age 78

CMS counts 133 Medicare patients who saw William Deardorff in 2024. The largest group is 75 to 84, with 47 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 45% are also on Medicaid. Their average risk score is 2.49, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts William Deardorff's median patient age at 79, with 57% women.

Medicare patients, 2024133
Average age78
Average risk score2.49
Also on Medicaid45%

William Deardorff's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

William Deardorff's Medicare patients by sex, 2024

  • Women8665%
  • Men4735%

Chronic conditions among William Deardorff's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis73%
  4. Mood disorders55%
  5. Depression53%
  6. Diabetes47%
  7. Chronic kidney disease46%
  8. Heart failure41%

Share of Medicare patients with each condition. A patient can have several.

William Deardorff's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 79

Patient panel by sex, all payers

  • Women57%
  • Men35%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

William James Deardorff wrote 893 Medicare Part D claims in 2024

In 2024, William Deardorff wrote 893 Medicare Part D claims for 48 patients. 93% of them were for generic drugs. CMS names the drug for 712 of them, across 24 drugs with 11 or more claims each, at $19,399 in total drug cost. In 2023, CMS named 268 claims across 15 drugs.

Part D claims, 2024893
Drugs named by CMS24
Total drug cost$19,399
Part D patients48

William Deardorff's Part D claims by kind of drug, 2024

  • Generic832 claims93%
  • Brand-name61 claims7%

William Deardorff's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in William Deardorff's Part D claims, 2024

  • Opioids2%14 of 893 claims
  • Antibiotics1%13 of 893 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 2682024: 712166%

Drugs named by CMS: 24 in 2024, 15 in 2023.

See all prescribing by William Deardorff

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

William James Deardorff scored 100 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for William Deardorff for performance year 2024, reported as part of a group. William Deardorff accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Accepts Medicare assignment
Yes

William Deardorff's MIPS scores, performance year 2024

  • 100of 100Final score
  • 95of 100Quality
  • 40of 100Improvement Activities
  • 81of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026

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William James Deardorff has 19 publications on record

Dmand AI links 19 papers to William Deardorff, published from 2014 to 2022. 2022 was the busiest year, with 3. The most frequent topics are Cognitive Dysfunction, Dementia and Hearing Loss. William Deardorff has published most often in J Am Geriatr Soc. William Deardorff's most frequent co-authors are Sei J. Lee, MD, George T. Grossberg, MD and Harish Dharmarajan, MD.

Papers19
Years published2014 to 2022

William Deardorff's papers by year, 2014 to 2022

Topics William Deardorff writes about most

  • Cognitive Dysfunction
  • Dementia
  • Hearing Loss
  • Independent Living
  • Medicare
  • Activities of Daily Living
  • Alzheimer Disease
  • Cholinesterase Inhibitors

William Deardorff's most frequent co-authors

Recent publications by William Deardorff

See all 19 publications and co-authors

See who William Deardorff researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who William Deardorff works with, so you can find a warm path to the right geriatric medicine (internal medicine) physicians.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

William James Deardorff received $99 in industry payments in 2022

CMS Open Payments shows 1 general payment to William Deardorff from 1 drug or device company in 2022. Food and beverage make up the largest share, 100% of the total. Eisai Inc. paid the most, $99.

Companies that paid William Deardorff the most, 2022 to 2022

Share is of all general payments to this clinician.

See all payments to William Deardorff

Source: Open Payments (CMS), 2025 data, released July 7, 2026

William James Deardorff graduated from Saint Louis University School Of Medicine

William Deardorff graduated from Saint Louis University School Of Medicine in 2017.

  1. Medical schoolSaint Louis University School Of Medicine
  2. Board certified in geriatric medicineAmerican Board of Family Medicine
  3. Board certified in geriatric medicineAmerican Board of Internal Medicine
  4. Board certified in internal medicineAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

William James Deardorff accepts plans from 6 insurance carriers

William Deardorff is in network with 6 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.

  • Blue Cross Blue Shield of Michigan
  • Blue Cross Blue Shield of Massachusetts
  • HCSC
  • Regence Health Plans
  • CMS Medicare
  • Molina

Plan types William Deardorff accepts, by number of carriers

  1. Medicare6
  2. PPO4
  3. HMO1
  4. POS1

Source: Dmand AI Insurance Network Data

Sources for William James Deardorff's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about William James Deardorff

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is William James Deardorff's NPI number?

William James Deardorff's NPI number is 1003348830. It was assigned on March 30, 2017, and it is active in the NPI Registry.

What does William James Deardorff specialize in?

William James Deardorff is a geriatric medicine (internal medicine) physician in San Francisco, California. The primary specialty in the NPI Registry is Geriatric Medicine (Internal Medicine) Physician (taxonomy code 207RG0300X).

Where does William James Deardorff practice?

William Deardorff practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. William Deardorff's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. Dmand AI also links William Deardorff to 2 medical groups and 1 skilled nursing facility.

What is William James Deardorff's office phone number?

The practice phone on file for William Deardorff is (415) 353-2733.

What is William James Deardorff's medical license number?

William Deardorff holds California license A169642, one of the licenses on file in 2 states.

Which states has William James Deardorff been licensed in?

Dmand AI has state licenses on file for William Deardorff in California (2020 to 2026) and North Carolina (2017 to 2020).

Which hospitals is William James Deardorff affiliated with?

William Deardorff practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.

What medical group is William James Deardorff part of?

William Deardorff is linked to UCSF Pediatrics. Dmand AI links William Deardorff to 2 more medical groups.

Does William James Deardorff accept Medicare?

Yes. CMS data shows William Deardorff billed Medicare for 219 services in 2024, and William Deardorff accepts Medicare assignment.

What is William James Deardorff's MIPS score?

William Deardorff's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.

Show 10 more questionsShow fewer questions

How many Medicare patients does William James Deardorff see?

CMS counts 133 Medicare patients who saw William Deardorff in 2024, with an average age of 78.

Is William James Deardorff board certified?

Yes. William Deardorff is board certified in geriatric medicine by the American Board of Family Medicine.

What services does William James Deardorff bill to Medicare?

In 2024, William Deardorff's most billed Medicare services were nursing facility care (99310), hospital inpatient care (99233) and medicare service (G0317).

Where did William James Deardorff go to medical school?

William Deardorff graduated from Saint Louis University School Of Medicine in 2017.

What drugs does William James Deardorff prescribe most?

In 2024 Medicare Part D data, William Deardorff's most prescribed drugs by claims were Omeprazole, Metformin HCl and Metformin HCl ER.

Has William James Deardorff received payments from drug or device companies?

CMS Open Payments shows $99 in general payments to William Deardorff from 1 company from 2022 to 2022. The largest total came from Eisai Inc.

How long has William James Deardorff been practicing?

William Deardorff graduated from medical school in 2017, 9 years ago.

Does William James Deardorff do research?

Dmand AI links 19 publications to William Deardorff, published from 2014 to 2022.

Who does William James Deardorff publish with?

William Deardorff's most frequent co-authors are Sei J. Lee, MD (6 shared papers), George T. Grossberg, MD (3 shared papers) and Harish Dharmarajan, MD (2 shared papers).

What insurance does William James Deardorff accept?

William Deardorff is in network with 6 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.

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